발간논문

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Vol.33, No.11, 1406 ~ 1414, 1995
Title
A Study on the Change of Microstructures with P and / or Sr Treatment in A390 Alloy
이정무Jung Moo Lee, 강석봉Suk Bong Kang
Abstract
Effects of melt treatment with phosphorus and/or strontium on the microstructures have been investigated in hypereutectic Al-Si alloys. Phosphorus made finely and uniformly distributed primary Si but did not affect the eutectic Si. Strontium addition changed the morphology of eutectic Si from acicular form to fibrous one while it coarsened the size of primary Si. Simultaneous addition of phosphorus and strontium had a deleterious effect on the refinement of primary Si. Further, it reduced the modification effect of strontium. When phosphorus was added to the strontium treated alloy during remelting, the morphology of eutectic Si was changed to fibrous form but the primary Si was coarsened. Meanwhile, when strontium was added to the phosphorus treated alloy during remelting, primary Si was refined and the modification effect of Sr was also maintained.
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